Flender increases torque of all-steel disc coupling

Flen­der is round­ing off its range of N‑Arpex cou­plings, first intro­duced in 2017, with two new designs fea­tur­ing eight and ten bolt­ing points. N‑Arpex now cov­ers a diam­e­ter up to 988 mm and a torque up to 2,000,000 Nm. The com­pact design and enhanced bore capac­i­ties also enable a leap in size. A small­er cou­pling trans­mits a high­er torque com­pared to the pre­de­ces­sor mod­el Arpex. Flen­der thus fur­ther opti­mis­es the price-per­for­mance ratio. The tor­sion­al­ly rigid all-steel disc cou­pling is suit­able for use in dri­ve appli­ca­tions includ­ing pumps, fans, com­pres­sors, gen­er­a­tors, tur­bines, and paper and print­ing machines.

A new, more com­pact Flen­der con­i­cal bolt con­nec­tion for the plate packs enable quick and easy instal­la­tion of the N‑Arpex cou­plings, espe­cial­ly in high torque ranges. This new addi­tion enhances the pow­er den­si­ty of the N‑Arpex series. The revised com­po­nent first appeared in 2017 with the ARN‑6 type. Its com­pact design and enhanced bore capac­i­ties already ensured an opti­mal ratio between torque and use of mate­ri­als. The N‑Arpex thus focuss­es even more sharply on the price-per­for­mance ratio.

With the two new N‑Arpex cou­plings, Flen­der has intro­duced a mod­u­lar sys­tem which increas­es the num­ber of avail­able types as well as simul­ta­ne­ous­ly reduc­ing the num­ber of com­po­nents required. The three stan­dard series of the pre­de­ces­sor Arpex merge into one N‑Arpex series. This stan­dard­iza­tion sim­pli­fies stor­age, mak­ing the cou­plings more read­i­ly avail­able and reduc­ing spare parts com­plex­i­ty for the customer.

The new series of cou­plings has also been designed for use in poten­tial­ly explo­sive envi­ron­ments as defined in direc­tive 2014/34/EU and ful­fil the require­ments of API610/ISO13709 and API671/ISO10441. N‑Arpex all-steel cou­plings are designed as stan­dard for use at very low tem­per­a­tures down to ‑50 degrees Cel­sius. With these all-steel cou­plings, trans­mis­sion of torque between the machine shafts accom­pa­nied by dis­place­ment com­pen­sa­tion is back­lash-free, tor­sion­al­ly rigid and flex­i­ble. This enables them to simul­ta­ne­ous­ly com­pen­sate for axi­al, angu­lar and radi­al off­set. The N‑Arpex cou­pling plate packs are made of stain­less spring steel, are not sub­ject to wear and are there­fore maintenance‑free.